Ian Anderson promises new music in 2014. And while he knows what direction the project will take (it's a concept album), details -- like whether or not it will be a solo record or a Jethro Tull LP -- are still up in the air. Either way, Anderson says it will be a folk-prog-metal hybrid.

By 1978, Jethro Tull had been running for 10 years, and though their commercial fortunes and profile had soared with albums like 'Aqualung' and 'Thick as a Brick,' the band was still at its creative peak, as its 11th album, 'Heavy Horses,' proves.